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What is the body length of the parasite Cryptosporidium parvum?
Question
#68356. Asked by uclageographer. (Jul 17 06 11:09 AM)
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Brainyblonde
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The characteristic stages of Cryptosporidium are excystment, asexual budding (schizogony/ merogony), sexual multiplication (gamogony), zygote and oocyst formation, and sporogony.
Mature oocysts contain 4 sporozooites. The oocysts ‘excyst’ to liberate sporozooites in the gastrointestinal tract.
Excystation is possibly triggered by a combination of environmental conditions such as pH, bile salts, carbon dioxide and temperature (Fayer & Leek, 1984).
The free sporozooites attach to epithelial cells and at this point are referred to sometimes as trophozooites.
Electron micrograph: a trophozoite (2-2,5 µm in diameter) attached to epithelial cells. Trophozoites are characterized by the presence of a nucleus with a large nucleolus, and a feeder organelle in the attachment zone.
http://www.cdfound.to.it/HTML/khan.htm
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